package io.joyrpc.transport.codec;

/*-
 * #%L
 * joyrpc
 * %%
 * Copyright (C) 2019 joyrpc.io
 * %%
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *     http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * #L%
 */

import io.joyrpc.transport.channel.Channel;

/**
 * 编解码上下文
 */
public interface CodecContext {

    /**
     * 获取连接通道
     *
     * @return
     */
    Channel getChannel();

    /**
     * 获取上下文参数
     *
     * @param key key
     * @param <T> 泛型
     * @return T
     */
    default <T> T getAttr(String key) {
        throw new IllegalArgumentException();
    }

    /**
     * 设置上下文参数
     *
     * @param key   key
     * @param value value
     * @param <T>   泛型
     * @return T
     */
    default <T> T setAttr(String key, T value) {
        throw new IllegalArgumentException();
    }
}
